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Displaying 30876 - 30900 of 74251

Detection of Interstellar Cyanoformaldehyde (CNCHO)

December 31, 2007
Author(s)
Francis J. Lovas, Anthony J. Remijan, Jan M. Hollis, Wilmer D. Stork, Phil R. Jewell, D Meier
Cyanoformaldehyde (CNCHO) has been detected toward the star-forming region Sagittarius B2(N) with the 100 m Green Bank Telescope (GBT) by means of four P-branch rotational transitions in emission, the 7(0, 7) 6(1, 6) at 8.6GHz, the 8(0, 8) 7(1, 7) at 19.4

Developments in nano-oscillators based upon spin-transfer point-contact devices

December 31, 2007
Author(s)
Thomas J. Silva, William H. Rippard
We review the current status of research on microwave nano-oscillators that utilize spin transfer devices with point-contact geometry, with an emphasis on the open questions that still prevent our full understanding of device properties. In particular, we

Dynamically Programmable Digital Tissue Phantoms

December 31, 2007
Author(s)
Steven W. Brown, Joseph P. Rice, David W. Allen, Maritoni A. Litorja, Karel Zuzak, Edward Livingston
As optical imaging modalities gain acceptance for medical diagnostics and become common in clinical applications, standardized protocols to quantitatively assess optical sensor performance are required to ensure commonality in measurements and to validate

Integrating Learning Into a Hierarchical Vehicle Control System

December 31, 2007
Author(s)
James S. Albus, Roger V. Bostelman, Tsai H. Hong, Tommy Chang, William P. Shackleford, Michael O. Shneier
The National Institute of Standards and Technology s (NIST) Intelligent Systems Division (ISD) is a participant in the Defense Advanced Research Projects Agency (DARPA) LAGR (Learning Applied to Ground Robots) Program. The NIST team s objective for the

International Legal Metrology Organizational Primer

December 31, 2007
Author(s)
S. W. Stiefel
The world's metrology and legal metrology infrastructure abounds with organizations that play differing roles such as measurement research, standards, and accreditation. Associated with these organizations is a bewildering assortment of acronyms. This

Making Biometric Systems Usable Let's Not Forget the User

December 31, 2007
Author(s)
Mary F. Theofanos, Brian C. Stanton
The use of physical identifiable characteristics (biometrics) in border and transportation security has increased since 9/11. Currently, the United States Visitor and Immigrant Status Indicator Technology (US-VISIT) program collects a right and left index

Multi-Channel Mobile Ad-Hoc Links for Multimedia Communications

December 31, 2007
Author(s)
Hamid Gharavi
This paper is mainly concerned with multi-channel transmission of real-time information such as video over multi-hop ad-hoc links. We propose two multi-channel routing protocols. The first is based on single-path routing and aims at suppressing the intra

Multi-Probe Assembly

December 31, 2007
Author(s)
John Wason, William Gressick, J Wen, Jason J. Gorman, Nicholas Dagalakis
This paper describes the algorithm development and experimental results of a multi-probe micro-assembly system. The experimental testbed consists of two actuated probes, an actuated die stage, and vision feedback. The kinematics relationships for the

Multiscale modeling of point defects in strained silicon

December 31, 2007
Author(s)
Vinod Tewary, B. Yang
A multiscale Green's function method is described for modeling substitutional point defects and vacancies in strained silicon. The model seamlessly links the length scales from atomistic to macro. The model accounts for the discrete lattice effects

Spin-exchange Optical Pumping of 3He with Rb/K Mixtures and Pure K

December 31, 2007
Author(s)
Wangchun Chen, Thomas R. Gentile, S E. Babcock, T G. Walker
We have studied the efficiency of spin-exchange optical pumping (SEOP) in cells that contain either pure rubidium, mixtures of rubidium and potassium, or pure potassium. Optical pumping was performed with spectrally narrowed diode array lasers operating at

X-Ray and Gamma-Ray Absorbed Dose Profiles in Teeth: An EPR and Modelling Study

December 31, 2007
Author(s)
S Sholom, C M. O'Brien, E Bakhanova, V Chumak, Marc F. Desrosiers, A Bouville
Dose profiles in teeth have been experimentally and theoretically studied for different energies and geometries of incident X- and gamma-rays. The experiments were conducted with teeth inside of an Alderson phantom using monodirectional radiation beams at

EPR Tooth Dosimetry of SNTS Area Inhabitants

December 29, 2007
Author(s)
S Sholom, Marc F. Desrosiers, A Bouville, N Luckyanov, V Chumak, S L. Simon
Determination of external dose to teeth of inhabitants of settlements near the Semipalatinsk Nuclear Test Site (SNTS) was conducted using the EPR dosimetry technique to assess exposures associated with radioactive fallout from the test site. In this study

Equi-Axed Grain Formation in Electrodeposited Sn-Bi

December 29, 2007
Author(s)
E Sandnes, Maureen E. Williams, Mark D. Vaudin, Gery R. Stafford
Sn is widely used as a coating in the electronics industry because it provides excellent solderability, ductility, electrical conductivity and corrosion resistance. However, Sn whiskers have been observed to grow spontaneously from Sn electrodeposits and

Undoped polythiophene FETs with field-effect mobility of 1 cm^2 V^-1 s^-1

December 29, 2007
Author(s)
Behrang Hamadani, Iain McCulloch, Martin Heeney, David J. Gundlach
We report on charge transport in organic field-effect transistors based on (2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) as the active polymer layer with saturation field-effect mobilities as large as 1 cm2 V-1 s-1. The dependence of mobility

A Brief History of PRIDE

December 28, 2007
Author(s)
Zeid Kootbally, Craig I. Schlenoff, Rajmohan Madhavan
PRIDE (PRediction In Dynamic Environments) is a framework that provides an autonomous vehicle's planning system with information that it needs to perform path planning in the presence of moving objects. The underlying concept is based upon a multi

A Common Operator Control Unit Color Scheme for Mobile Robots

December 28, 2007
Author(s)
Michael O. Shneier, Roger V. Bostelman, James S. Albus, William P. Shackleford, Tommy Chang, Tsai Hong Hong
The Intelligent Systems Division at the National Institute of Standards and Technology (NIST) has partici-pated in the Defense Advanced Research Project Agency (DARPA) Learning Applied to Ground Robots (LAGR) project for the past 2 ? years. In Phase 2 of

A Framework for the Evaluation of Pervasive Information Systems

December 28, 2007
Author(s)
Jean C. Scholtz, Mary F. Theofanos, Sunny Consolvo
In this chapter we present a framework of areas of evaluation for pervasive information systems along with metrics and examples from the literature. We review a number of methodologies that have been used in evaluation. A case study of an evaluation using
Displaying 30876 - 30900 of 74251